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Yutaka Ueda, Akira Noguchi
1983 Volume 52 Issue 3 Pages
713-715
Published: March 15, 1983
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It is shown that it is possible to construct a model that realizes the soliton and the chaos simultaneously though they seem to be entirely different phenomena. This model is formulated with geodesics on the upper half-plane, which can be interpreted as the soliton or as the chaos.
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Masakatsu Sakisaka, Hirofumi Hanaki, Nobuo Nagai, Tadahiko Horiuchi, I ...
1983 Volume 52 Issue 3 Pages
716-717
Published: March 15, 1983
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Referring to the observed single- to penta-electron transfer cross sections for Kr
q+ (
q=2∼9) ions on various gas targets, a model is presented that projectile ion captures electrons from an electron cloud of target particle through a statistical way. This is closely related with the classical one electron model.
A representative comparison is shown between the experiment and the present model for Kr
q+–Kr collisions at 24 keV impact energy.
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Iwao Hosokawa
1983 Volume 52 Issue 3 Pages
718-721
Published: March 15, 1983
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The stochastic differential equation for the dynamical fields acted by Gaussian, non-white random force is formulated on the basis of the author’s previously developed functional treatise on statistical hydromechanics, with derivation of the spectral representation of the random force fields.
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Takasi Kawaguti, Yasunobu Fujimori
1983 Volume 52 Issue 3 Pages
722-725
Published: March 15, 1983
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The magnetoresistance in thin films of silver and gold has been measured in the temperature range 1.1 K–4.2 K. It is in good agreement with the theoretical results in weakly localized regime with suitable values of the spin-orbit scattering time. The inelastic scattering time is nearly in inverse proportion to temperature.
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Yoshimasa Isawa
1983 Volume 52 Issue 3 Pages
726-727
Published: March 15, 1983
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We propose a physical microscopic model explaining 1⁄
f fluctuations in metals. The model is based on the scattering of the diffusely propagating conduction electrons due to surface phonon modes via randomly distributed defects. This leads to 1⁄
f fluctuation in the energy spectral density of conduction electron. Theoretical results are in agreement with the experimental ones and the empirical formulas.
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Masashi Takigawa, Hiroshi Yasuoka, Takaho Tanaka, Yoshio Ishizawa
1983 Volume 52 Issue 3 Pages
728-731
Published: March 15, 1983
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11B NMR measurement has been made on a typical dense Kondo system CeB
6 mainly in the intermediate temperature phase II by using a single crystal. From the analysis of the angular dependence of the NMR spectra, we propose a quite unusual spin structure in phase II in which the external field induces not only the uniform magnetization but the antiferromagnetic moment which has a triple-
q structure.
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Haruo Moriguchi, Toshiyuki Nakamura
1983 Volume 52 Issue 3 Pages
732-743
Published: March 15, 1983
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Integrating numerically the Duffing Equation
(
Remark: Graphics omitted.),
the periodic solutions and the response curves have been studied for hard system (β≥0). Peculiar behaviors of the accurate response curves are found—the existence of the higher harmonic resonances of odd order, where the response curves have loops, and those of even order, where the response curves have branches accompanied with loop. As
k approaches zero, the loops expand infinitely. As
k increases, the loops change into simple maximums which vanish finally as well as the branches.
For vanishing
k the subharmonic resonances of any integral and fractional order have been found so far as trials have been done. They vanish when
k increases or β approaches zero under positive
k. Also the linear limits of the responses are considered.
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Ryogo Hirota, Masaaki Ito
1983 Volume 52 Issue 3 Pages
744-748
Published: March 15, 1983
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Resonances of solitons in one-dimensional space are studied theoretically taking the Sawada-Kotera equation with a nonvanishing boundary condition as an example. Two solitons near the resonant state exhibit the new phenomena. They interact with each other through emitting and absorbing third soliton. They are transmuted into singular solitons after colliding with each other. Two solitons at the resonant state fuse after colliding with each other, or a soliton splits into two solitons.
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Kenji Ohkuma, Miki Wadati
1983 Volume 52 Issue 3 Pages
749-760
Published: March 15, 1983
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The trace method which has been proposed by one of the authors (M.W.) and Sawada is applied to the Kadomtsev-Petviashvili equation with negative dispersion. The N-soliton solution and the Gelfand-Levitan equation are derived through the trace method. Soliton resonances are studied. It is found that the soliton resonance occurs when a virtual soliton in soliton solution turns into exact 1-soliton. Furthermore some interesting examples of soliton resonance related to 3-soliton solution are pointed out.
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Etsuro Date, Michio Jimbo, Tetsuji Miwa
1983 Volume 52 Issue 3 Pages
761-765
Published: March 15, 1983
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As a continuation of previous work, discretization of nonlinear Schrödinger equation and its analogues are discussed as the reduction of 2-component KP hierarchy.
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Etsuro Date, Michio Jimbo, Tetsuji Miwa
1983 Volume 52 Issue 3 Pages
766-771
Published: March 15, 1983
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As a continuation of previous work, method for generating difference and/or differential soliton equations is described for the KP family of orthogonal type (BKP), and for the case related to an elliptic curve.
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Toshihico Arimitsu, Fumiaki Shibata
1983 Volume 52 Issue 3 Pages
772-779
Published: March 15, 1983
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A basic formulation of the laser system is given in the form most convenient to study the time-dependent cooperative (
symmetry breaking) behavior of the system in the far-from-equilibrium states from the microscopic and fully quantum-statistical-mechanical point of view. The quantum mechanical master equation, derived from a microscopic model Hamiltonian, is mapped onto a c-number function space with the use of the Boson and spin coherent states representations. The
distribution function (mapped from the density operator) is expanded in terms of the Hermite polynomials and the spherical harmonics to obtain differential equations for the expansion coefficients with which time evolution of the laser system can be determined completely.
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Seiji Miyashita
1983 Volume 52 Issue 3 Pages
780-786
Published: March 15, 1983
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Phase transitons on fully frustrated Ising models with degeneracy-breaking field are studied. Some rigorous results have been obtained for the square lattice. Phase transitions on other frustrated models are also discussed.
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Yasuko Maeda
1983 Volume 52 Issue 3 Pages
787-795
Published: March 15, 1983
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2.1 GeV/n Ne beams of BEVALAC were vertically exposed to the emulsion chamber. The angular and number distributions of projectile fragments of Ne interactions in the mixture of emulsion and polystyrene were examined. The results were compared with those of interactions of other kinds of high energy heavy nuclei.
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Jasbir Singh, M. L. Garg, Ravinder Kaur, S. S. Sooch, Nirmal Singh, P. ...
1983 Volume 52 Issue 3 Pages
796-801
Published: March 15, 1983
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The structure of
105Pd levels populated in the decay of 41.29d
105Ag has been investigated using a 64.1 cc Ge(Li) detector in singles mode and a 64.1 cc Ge(Li)-7.6 cm×7.6 cm NaI(Tl) detector set-up in coincidence mode. The gamma ray singles spectrum measurements confirm the existence of 158.93, 167.5, 202.17, 216.11, 382.5, 486.65, 576.64, 583.01, 844.34, 860.20, 921.23, 929.01 and 1124.90 keV gamma rays in the decay of
105gAg. However, the 270.5, 564.39, 580.13, 610.0, 640.5, 709.8, 768.9 and 796.25 keV weak transitions reported by earlier workers could not be observed in present investigations. The γ-γ directional correlation coefficients for 7 cascades in
105Pd have been measured. Out of these the 361–(447)–280 and 807–280 keV cascades have been attempted for the first time. From these correlation measurements the spin value of 1⁄2
+ has been confirmed for the 673.03 keV level and found the multipole mixing ratios of various transitions in
105Pd.
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Eiichi Arai, Masanobu Futakuchi, Jun Komaki, Masao Ogawa, Yoshiyuki Og ...
1983 Volume 52 Issue 3 Pages
802-810
Published: March 15, 1983
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Using a proton beam with an overall resolution of 300–400 eV (FWHM) spins, parities and partial widths were determined for all resonances observed (25
s-wave, 32
p-wave, 34
d-wave and two
g-wave resonances). Differential cross sections were measured for proton elastic scattering at incident energies between 3.15 and 4.0 MeV and for proton inelastic scattering at incident energies between 3.15 and 3.48 MeV. Spectroscopic factors and Coulomb displacement energies were extracted for the fragmented analogue resonances which corresponded to the 5⁄2
+, 1⁄2
−, 5⁄2
+, 9⁄2
+, 9⁄2
+ and 1⁄2
+ states in
51Cr at 3.979, 4.036, 4.070, 4.101, 4.155 and 4.610 MeV, respectively. A value of the
s-wave proton strength function was deduced.
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Takeyoshi Fujita, Kiyoshi Ogura, Yoiti Watanabe
1983 Volume 52 Issue 3 Pages
811-817
Published: March 15, 1983
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By means of the eikonal theory of Glauber, differential cross sections are computed for the electron elastic scattering from a water molecule in the high and intermediate energy regions of electrons: i.e. for energies higher than 50 eV. The calculated differential cross sections are found to be in a good agreement with recent experimental data. As the target wave functions, the molecular orbitals given by Lin and Duncan (a united atom model with fixed nuclei) are used for simplicity. The validity of the model is tested by a comparison among the Born differential cross sections calculated by the use of a few different wave functions of the water molecule.
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Wen-Jia Chen
1983 Volume 52 Issue 3 Pages
818-826
Published: March 15, 1983
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The triple differential cross section for the electron-impact ionization of atomic hydrogen is analysed in a coplanar geometry by using the Coulomb-projected-eikonal approximation, where the two outgoing electrons are considered to be in uncorrelated Coulomb-continuum states. The scattering amplitude for the ionization is expressed as a three-dimensional integral in real space. A comparison is made with the experimental data and with results of other approximation methods. It is found that the method proposed here has some advantage over the conventional partial-wave technique and provides a better description both for the binary recoil collisions in the small momentum transfer condition.
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Hiroshi Tokunaga
1983 Volume 52 Issue 3 Pages
827-833
Published: March 15, 1983
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The Burgers turbulence at extremely large Reynolds numbers expressed as a train of random triangular shocks is investigated by calculating its temporal development numerically. As a result it is found that the train of random triangular shocks settles down to a similarity state determined by the mean interval between two consecutive shock fronts
l(
t). In this state the turbulent energy decays as (
Remark: Graphics omitted.). The correlation function is expressed as
R(
r,
t)⁄
R(0,
t)\simeq1−0.73
r⁄
l(
t) for small
r and vanishes for large
r, remaining positive. The energy spectrum
E(
k,
t) is approximately conserved in time at small wave numbers and constant with respect to
k, and
E(
k,
t)=
A{
kl(
t)}
−2,
A being constant, at large wave numbers.
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Tsutomu Kambe
1983 Volume 52 Issue 3 Pages
834-841
Published: March 15, 1983
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A viscous two-dimensional flow of shear layers superimposed on a stagnation point flow is investigated. This situation allows an exact solution of unsteady Navier-Stokes equation of an incompressible fluid in free space for a general initial condition. The solution is exemplified for several sorts of initial condition. One of them represents a flow in a balance between viscous diffusion and convective confinement of vorticity in the final asymptotic state. Another shows a flow field of collision of two shear layers of opposite senses, which is forced to come into contact by the imposed flow, and this collision results in ‘pair annihilation’ of the vortical layers. The decay of the vortex strength of the layer shows a similarlity behaviour for different Reynolds numbers. A comment is given about a possible dissipation mechanism in free flows.
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Hidenori Hasimoto
1983 Volume 52 Issue 3 Pages
842-847
Published: March 15, 1983
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The influence of an elliptic hole (of semi-axes
a1 and
a2,
t=
a2⁄
a1≤1) on the shear flow along a thin solid plane wall is investigated on the basis of the Stokes equation. Exact solution is obtained in terms of ellipsoidal coordinates. If the flow is parallel to the major (or minor) axis, a radial incoming flow induced upstream along ±π⁄4 direction to the wall moves almost parallel to the axis in the neighbourhood of the hole and is reflected into a radial outgoing flow. The total flux of this flow is found to be (
Remark: Graphics omitted.), where
c=
t2K+(1−2
t2)
E (or (2−
t2)
E−
t2K),
K and
E being the complete elliptic integrals with the modulus
k=(1−
t2)
1⁄2.
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Suketsugu Nakanishi, Mitutosi Kawaguti
1983 Volume 52 Issue 3 Pages
848-855
Published: March 15, 1983
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The flow of viscous fluid in a channel with progressive waves of wall contraction is numerically studied as a two-dimensional model of peristaltic flow.
In order to clarify the flow connected with peristaltic motion, the peristaltic flow of viscous fluid through a channel with progressive waves of wall contraction is investigated for the following various parameters: the Reynolds number, wave length, amplitude of contractive wave, and pressure gradient along the channel.
As the results, the rate of fluid transport by the peristaltic motion is shown as a function of these parameters.
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Muhammad Bashir Chaudhry
1983 Volume 52 Issue 3 Pages
856-866
Published: March 15, 1983
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Electrostatic drift ion cyclotron waves in the presence as well as in the absence of an ambipolar field in a sheet plasma of thickness of the order of the ion Larmor radius have been studied numerically. The frequency range considered is of the order of ion cyclotron frequency ω
ci. The method is based on an integral equation in the wavenumber space derived from the Vlasov-Poisson system of equations. Eigenfrequencies and eigenfunctions of the waves with and without ambipolar field are studied by varying the plasma thickness, the perpendicular wavenumber and the parallel wavenumber. A strong ambipolar field seems to be effective for the suppression of the drift ion cyclotron instability in sheet plasmas. The validity of local dispersion relation is checked.
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Tadashi Ohgo
1983 Volume 52 Issue 3 Pages
867-874
Published: March 15, 1983
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Time- and space-resolved observations of fluctuating electric fields are made using the plasma satellites of the HeI 492.2 nm line during art implosion phase in a small-linear theta pinch. The rapid excitation (up to ∼6 kV/cm) and decay of the fluctuating fields with the frequency smaller than the electron plasma frequency are observed except near the center of the plasma column. Measurement of the magnetic field
Bz indicates that the intense fluctuating fields are localized in a narrow layer just behind the imploding magnetic front. From a measurement of the ion temperature, the fast ion heating and thermalization are observed in the implosion phase. These fast heating and thermalization and the decay of the fluctuations are almost coincident in time.
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Noriyoshi Sato, Rikizo Hatakeyama, Satoru Iizuka, Tetsu Mieno, Koichi ...
1983 Volume 52 Issue 3 Pages
875-884
Published: March 15, 1983
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Stationary double layers are generated in a magnetoplasma by applying potential differences between two heated plates on which the plasma is produced by surface ionization. Their potential drop φ
D is varied over a wide range
eφ
D⁄
Te\simeq1–2×10
3 (
Te: electron temperature in eV) without any influence from volume ionization of the background gas. There are always spiky fluctuations especially on the low-potential tail of the double layer. By measuring the double-layer formation process, a localized potential drop is found to be formed initially in front of the plate on the low-potential side, being accompanied with current limitation. This localized potential drop moves along the plasma column, but finally stops and results in the formation of the stationary double layer in the presence of sufficient plasma supply from the plate on the high-potential side.
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Akio Ishida, Shohei Kobayashi, Kazuo Kitao
1983 Volume 52 Issue 3 Pages
885-894
Published: March 15, 1983
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A two-fluid energy principle is developed that leads to sufficient conditions for the low frequency stability of an axisymmetric, field-reversed ion ring immersed in a dense, background plasma. It is assumed that the ion ring is described as the rigidly rotating fluid with finite temperature while the background plasma as the stationary fluid. The stability condition is approximately given by the potential energy
W(
ξp,
ξb)>0, where
ξp and
ξb are the displacements of the ring and the background plasma, respectively.
As an application, the stability condition for kink modes of a long ion layer immersed in a cold background plasma is examined in detail in order to compare the existing theories with the present theory.
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Kenji Kimura
1983 Volume 52 Issue 3 Pages
895-904
Published: March 15, 1983
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The dechannelling cross sections of axially channelled MeV H and He ions at dislocations in silicon and nickel crystals were studied. The obtained dechannelling cross section for dislocation in nickel was proportional to the square root of the ion energy, while that for dislocation in silicon was deviated from \sqrt
E-dependence because of the dissociation of the dislocation into a pair of partial dislocations with ribbon of stacking fault between them. The width of the dissociated dislocation was determined by the comparison of the experimental cross sections with the results of the numerical calculation of the dechannelling cross section at the dissociated dislocation. The obtained width was 9±2 nm for dissociated edge dislocation in silicon. The experimental results for nickel suggested that dislocation in nickel does not dissociate and that the upper limit of the width of dissociation was estimated to be 2 nm. The stacking fault energies calculated from these widths were 42±10 erg/cm
2 for silicon and larger than 80 erg/cm
2 for nickel.
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Takashi Fujikawa, Tomoyuki Matsuura, Haruo Kuroda
1983 Volume 52 Issue 3 Pages
905-912
Published: March 15, 1983
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We propose the short-range order multiple scattering XANES theory based on the method previously developed by us. In this method, atoms are not classified into shells but the scattered waves are classified into a direct term and a fully multiple scattering term. This classification is useful to derive the XANES formula which can directly be compared with EXAFS formula. This method can be easily applied to considerably large systems. We show how the structural information is obtained from the XANES spectra.
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Hiroshi Ito, Yoichi Shiozaki, Etsuro Sawaguchi
1983 Volume 52 Issue 3 Pages
913-919
Published: March 15, 1983
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A previously proposed model of rhombohedral PbZr
0.9Ti
0.1O
3 (low temperature form) has been confirmed and refined at room temperature. X-ray diffraction data as well as neutron diffraction data of PbZr
0.9Ti
0.1O
3 powder have been analysed by profile analysis method. The result is in general agreement with that by Glazer and Mabud, and the structural parameters are now improved considerably. Rather unrealistic temperature parameters found in the previous study are corrected. Oxygen octahedra in the perovskite type unit cell rotate alternately clockwise and anticlockwise by 5.7 degrees about the polar axis, thus a superstructure appears. Additional atomic shifts (Pb 0.49 Å, Zr/Ti 0.22 Å with respect to oxygen) make the crystal ferroelectric, and the crystal is a structural hybrid of LaAlO
3 type and of rhombohedral ferroelectric BaTiO
3 type.
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Ikuo Yamamoto, Akihiko Hiroe, Shunsuke Hirotsu
1983 Volume 52 Issue 3 Pages
920-924
Published: March 15, 1983
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Intensity and shift of the Brillouin scattering due to the longitudinal acoustic phonons in NH
4LiSO
4 were measured precisely as functions of temperature near the ferroelectric phase transition point (
Tc=186.5°C). Anomalous decrease of the peak intensity was observed around several degrees below
Tc. This behaviour is interpreted in terms of the conventional Landau-Khalatnikov theory of critical relaxation. The relaxation time of the order parameter thus obtained is (0.9±0.1)×10
−10(
T0−
T)
−1 sec.
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Keiichi Yamamoto, Mikio Tsuji, Katsuyoshi Washio, Hajime Kasahara, Ken ...
1983 Volume 52 Issue 3 Pages
925-933
Published: March 15, 1983
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The infrared transmittance and reflectance spectra of amorphous fluorinated silicon films (a-Si: F) have been measured as a function of a ratio of SiF
4/(SiF
4+Ar) partial pressure and annealing temperature. The absorption bands were assigned: 1,015 cm
−1 (SiF
4 stretching), 965 cm
−1 (Si–F
3 stretching), 920 cm
−1 (Si–F
2 stretching), 870 cm
−1 ((Si–F
2)
2 stretching), 825 cm
−1 (Si–F stretching), 600 cm
−1 (Si–C stretching or Si 2LA mode), 515 cm
−1 (Si TO mode), 380 cm
−1 (SiF
4 bending), and 300 cm
−1 (Si LA mode). SiF
4 molecules incorporated into a-Si: F films are observed in samples prepared with high SiF
4 partial pressures, but in samples prepared lower SiF
4 partial pressures dangling bonds seem to be saturated by fluorine atoms. The transition from Si–F, Si–F
2, and Si–F
3 groups to SiF
4 molecules occurs above annealing temperatures (600°C). The total fluorine content is constant until crystallization, and a-Si: F films are found to be more stable than a-Si: H films.
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Iwao Hashimoto, Takao Yamauchi, Hiroyuki Yamaguchi
1983 Volume 52 Issue 3 Pages
934-941
Published: March 15, 1983
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Defects in quenched β-brass have been studied by transmission electron microscopy. Irregularly-shaped dislocation loops are formed heterogeneously along antiphase domain boundaries. Isolated black spot defects are also formed inside antiphase domains besides these loops and their density is about 3×10
19/m
3. The process of ordering by vacancy mechanism and clustering of quenched-in vacancies have been examined by means of the Monte Carlo simulation by taking into account both quenching rate and binding energy of vacancies. It is shown that excess vacancies aggregate along an antiphase domain boundary in the course of ordering during quenching. A possibility of the formation of black spot defects is also discussed on the basis of the above simulation.
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Yukio Okwamoto
1983 Volume 52 Issue 3 Pages
942-951
Published: March 15, 1983
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Recently Haldane has derived the Bethe ansatz equations describing the ground state properties of the massive Thirring model with finite ‘hole’ density (the quantum sine-Gordon model with finite soliton density). His derivation is explicitly confirmed here using a particular cutoff scheme, and his solutions of the equations in various limits are reviewed with complementary results. The commensurate-incommensurate transition in the two-dimensional sine-Gordon model with a uniaxial misfit is examined at finite temperatures using the results obtained in the massive Thirring model.
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Izumi Iwasa, Nobuo Saito, Hideji Suzuki
1983 Volume 52 Issue 3 Pages
952-962
Published: March 15, 1983
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The attenuation and the velocity of the longitudinal sound wave in low density bcc
3He crystals containing various amounts of
4He impurities from <10 ppm to 1600 ppm were studied at various temperatures, sound frequencies and stress amplitudes. It was found that a large number of dislocations were multiplied by the isotopic phase separation. Most of them are considered to be of screw type, and their irreversible motion causes the amplitude dependent attenuation and velocity change. The critical shear stress amplitude above which the attenuation increases does not depend on the
4He concentration nor on the temperature. Its magnitude is estimated to be τ
c=5×10
−5μ, where μ is the shear modulus. Because τ
c is only 1/6 of the Peierls stress and independent of
T, it is concluded that the screw dislocations penetrate the Peierls potential barrier by tunneling under the applied stress τ>τ
c.
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Shigeki Hoshino, Yoshimasa Kumashiro, Shuzo Takano
1983 Volume 52 Issue 3 Pages
963-972
Published: March 15, 1983
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The strain derivatives of the areas of several orbits on the Fermi surface in zinc (i.e. deformation parameters) were determined from the measurements of quantum oscillations of sound velocity in magnetic field up to 50 kG. The experimental values are in good agreement with the results calculated by the 3-OPW method proposed by Watts and Sundström. From the experimental and theoretical deformation parameter values, the values of the form factors of the pseudopotential matrix element and its derivatives with respect to
gi were determined;
V(
g0)=−0.0064 Ryd,
V(
g1)=0.0372 Ryd and
V(
g2)=−0.0351 Ryd, and d
V(
g0)⁄d(
g0⁄2
kF)=0.367 Ryd, d
V(
g1)⁄d(
g1⁄2
kF)=0.262 Ryd and d
V(
g2)⁄d(
g2⁄2
kF)=0.753 Ryd, where
g0,
g1 and
g2 are the [10\bar10]-, [10\bar11]- and [0002]-reciprocal lattice vector, respectively and
kF is free electron value of the Fermi wave number.
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Tuto Nakamura
1983 Volume 52 Issue 3 Pages
973-980
Published: March 15, 1983
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The overall nature of the image potential term is studied classically for a flat interfacial zone, where the dielectric constant changes from ε
1 to ε
2 as a function of distance normal to the interface. A perturbation theoretic approach is taken, where γ=(ε
1−ε
2)⁄(ε
1+ε
2) is shown to be a relevant expansion parameter. Results useful in treating the diffusive interface are given up to second order in γ.
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Takao Suzuki, Takefumi Tsuboi, Hideo Takaki, Takao Mizusaki, Tadashi K ...
1983 Volume 52 Issue 3 Pages
981-988
Published: March 15, 1983
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A reentrant superconducting transition was observed for the first time around the magnetic field, 3 T and the temperature, 0.5 K for Al thin films parallel to the magnetic field. The reentrant second order transition is discussed on the basis of Fulde’s theory with regard to the spin paramagnetic effect which is competitive with the orbital depairing effect under high magnetic field.
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Saburo Takahashi, Akio Kotani, Masashi Tachiki, Hideki Matsumoto, Hiro ...
1983 Volume 52 Issue 3 Pages
989-1001
Published: March 15, 1983
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The effect of the electromagnetic interaction between the persistent current and the rare earth moments is theoretically studied in the film of ferromagnetic superconductors. Depending on the film thickness and temperature, the ferromagnetic-like order, the spin-spiral-like order and the spin-sinusoidal-like order are predicted to occur in coexistence with superconductivity. From the calculation of the free energies of these states and the normal ferromagnetic state, the phase diagram is obtained in the plane of temperature and film thickness.
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Naoshi Suzuki
1983 Volume 52 Issue 3 Pages
1002-1007
Published: March 15, 1983
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Magnetic properties in the paramagnetic phase of pseudo-one-dimensional singlet-ground-state system RbFeCl
3 are studied by taking into account interchain coupling. Calculations are performed on the basis of three different approximations, dynamical correlated-effective-field approximation (D-CEFA) with single correlation parameter, D-CEFA with two correlation parameters, and static CEFA (S-CEFA). Among them D-CEFA with single correlation parameter explains most reasonably various magnetic properties such as the Néel temperature, the magnon dispersion, the temperature and magnetic-field (
H⁄⁄
c-axis) dependence of the magnon energies, and the field dependence of the Néel temperature. The ratio of the interchain coupling to the intrachain coupling is determined to be ∼0.1, which indicates poor one-dimensionality of RbFeCl
3.
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Naoshi Suzuki
1983 Volume 52 Issue 3 Pages
1009-1014
Published: March 15, 1983
Released on J-STAGE: June 01, 2007
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The dynamical correlated-effective-field approximation (CEFA) developed by the present author is extended to the helical spin structure specified by a general wave vector
Q. The advantage of the dynamical CEFA is that it can correctly take into account the single-ion energy term and the term of sin (
Q·
Rij)(
SiζSjξ−
SiξSjζ) characteristic to the helical spin structure, where ζ and ξ denote the rotating coordinate axis in the plane of the spin rotation. As an example the approximation is applied to the isotropic Heisenberg system, and the Néel temperature and the magnetization are calculated for the helical spin structures in the hexagonal lattice.
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Takeshi Ukai, Nobuo Mori
1983 Volume 52 Issue 3 Pages
1015-1017
Published: March 15, 1983
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The anisotropy energy for antiferromagnetic γ-Mn with collinear structure is calculated by using the new method improved by us based on Gilat and Raubenheimer’s one. It is shown that it is sufficient to take the channel width 10
−4 Ry and the number of mesh points 1872 in 1/6 of BZ for this calculation. Some discussion is given for the magnetic structure with the canted spin.
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Masao Hirano, Akira Misu
1983 Volume 52 Issue 3 Pages
1018-1024
Published: March 15, 1983
Released on J-STAGE: May 29, 2007
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A chromium ion concentration dependence of spin-lattice relaxation in the chromium ion ground state
4A
2 in ruby (Al
2O
3; Cr
3+) was measured in high magnetic fields from 69 KOe to 135 KOe. A critical Cr
3+ concentration is found to be about 0.16%, above which the spin-lattice relaxation rates show a strong concentration dependence and the electron distribution in
4A
2, quartet spin states, is interpreted in terms of a single spin temperature. From these facts it is concluded that only in the high concentration region, energy transfers among single Cr
3+ ions take place and electron spin states are in a thermal equilibrium.
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Min-Su Jang, Masaaki Takashige, Seiji Kojima, Terutaro Nakamura
1983 Volume 52 Issue 3 Pages
1025-1033
Published: March 15, 1983
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Raman spectra of oblique phonons in a tetragonal BaTiO
3 single crystal were obtained for different angle θ which the phonon wavevector
q makes with the
c-axis. A complete analysis of the data has been made on the basis of Merten’s equation. The spectrum of the oblique phonon on the branch that runs from the overdamped soft
E(
x)TO phonon to the underdamped 175 cm
−1 A1(
z)TO phonon has been found to show a peak in the range θ\gtrsim30°. This result provides a new method of obtaining the temperature dependence of the overdamped soft phonon.
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Y\={u}mi Ousaka, Osamu Sakai, Masashi Tachiki
1983 Volume 52 Issue 3 Pages
1034-1044
Published: March 15, 1983
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The dependence of the line shapes on the excitation energy in the Raman scattering (RS) of EuTe at low temperatures is theoretically studied, and is interpreted in terms of the modulation of 5d spin-orbit interaction by lattice displacement. A sharp line induced by the staggered magnetization appears in the vicinity of the absorption edge. This line is observed in off-diagonal Raman polarization configuration. For the incident light with energy near the middle of the exciton absorption, the sharp line disappears and broad line assisted by the magnon excitation appears in both off-diagonal and diagonal polarization configurations. These calculated results are consistent with the experimental result. The RS spectra under a weak magnetic field are also calculated.
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Ryumyo Onaka, Masahiro Kita
1983 Volume 52 Issue 3 Pages
1045-1049
Published: March 15, 1983
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Magnetic circular dichroism of the lowest exciton absorption bands of NaI, KI and RbI is studied and effective
g-values are obtained under the rigid shift assumption. The effective
g-values are found to be of the order of unity, and smaller in the heavier alkali iodides.
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Masuo Fukui, Osamu Tada
1983 Volume 52 Issue 3 Pages
1050-1056
Published: March 15, 1983
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Theoretical studies on nonlinear excitation and detection of surface exciton polaritons (SEP) by optical mixing are presented, taking into account the spatial dispersion effect. Numerically estimated power of the signal indicates that such a nonlinear effect allows us to obtain characteristics of SEP for an air-SEP active material geometry. Moreover, it can be expected that though the scattered intensity is considerably weak, it is detectable.
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Takeo Takizawa
1983 Volume 52 Issue 3 Pages
1057-1063
Published: March 15, 1983
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The wavelength derivative spectra of the direct exciton edge were observed in the temperature range from 80 to 300 K. The structures due to direct excitons were clearly observed and the accurate dependence of exciton energies on temperature was obtained. Line shape analysis was also made by using the Wannier exciton function as well as the model exciton dielectric function introduced first by Hopfield and Thomas. It was shown that the exciton dead layer plays an important role in optical reflectance of the direct edge.
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Masanori Hangyo, Hakaru Yamanaka, Riso Kato
1983 Volume 52 Issue 3 Pages
1064-1070
Published: March 15, 1983
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Resonant secondary emission in NaNO
2 has been investigated in the energy region near the zero-phonon line of the singlet absorption at ν
00 using a tunable dye laser. Multiple-order Raman scattering due to ν
2 vibration of NO
2− shows resonant enhancement under the excitation near ν
00. The secondary emission spectrum is composed of sharp (Raman-like) and relatively broad (luminescence like) components when excited near and above ν
00. Behaviors of the secondary emission spectrum with the change of the incident photon energy and its polarization characteristics are discussed. Variations of the spectrum with the change of the intensity of the incident light and the sample temperature are also discussed.
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Masayoshi Obashi, Tokuo Matsukawa
1983 Volume 52 Issue 3 Pages
1071-1074
Published: March 15, 1983
Released on J-STAGE: May 29, 2007
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The X-ray Cl
K absorption spectra in [Co(NH
3)
6]Cl
3, [Co(NH
3)
5Cl]Cl
2, trans-[Co(NH
3)
4Cl
2]Cl and Cs
2[CoCl
4] are measured with a high-resolution vacuum two-crystal spectrometer. The spectra, except that of [Co(NH
3)
6]Cl
3, show an extremely narrow absorption line at the absorption threshold. The result is interpreted on the basis of molecular orbital theory and it is proposed that the intensity of these narrow absorption lines depends on the chemical state between the cobalt and ligand chlorine ions. The narrow absorption line may well be attributed to transitions of the Cl 1
s electron into the
eg* antibonding orbitals having partially the 3
p character of chlorine in [Co(NH
3)
5Cl]Cl
2 and trans-[Co(NH
3)
4Cl
2]Cl. In Cs
2[CoCl
4] it may be ascribed to the Cl 1
s-
t2* transitions.
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Ichiro Aoki
1983 Volume 52 Issue 3 Pages
1075-1078
Published: March 15, 1983
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The entropy flux of incident solar radiation at the top of the earth atmosphere is given as 3.1×10
−5 [J cm
−2 s
−1 K
−1]. The entropy production on the earth is calculated from balance equations of radiation energy and entropy and shown to be 1.2×10
−4 [J cm
−2 s
−1 K
−1]. Those for other planets of the solar system are also given.
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